Commitments and Contingencies - Restricted Investments (Details) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Long-term Purchase Commitment [Line Items] | ||
| Total long-term restricted investments | $ 34,453 | $ 34,356 |
| Workers’ compensation obligations | ||
| Long-term Purchase Commitment [Line Items] | ||
| Total long-term restricted investments | 3,168 | 3,172 |
| Reclamation-related obligations | ||
| Long-term Purchase Commitment [Line Items] | ||
| Total long-term restricted investments | 27,268 | 27,238 |
| Financial payments and other performance obligations | ||
| Long-term Purchase Commitment [Line Items] | ||
| Total long-term restricted investments | $ 4,017 | $ 3,946 |